MP3120 Datasheet, PDF (1/10 Pages) Monolithic Power Systems – 1.2A, 1.1MHz Synchronous Boost Converter with Output Disconnect

The Future of Analog IC Technology
MP3120
1.2A, 1.1MHz Synchronous
Boost Converter with Output Disconnect
DESCRIPTION
The MP3120 is a high efficiency synchronous,
current mode step-up converter. The device
can boost a single cell or two cells AA battery
up to 5V.
The MP3120 can start up from an input voltage
as low as 0.8V and provide in-rush current
limiting as well as output short circuit protection.
The integrated P-Channel synchronous rectified
switch provides improved efficiency and
eliminates the need of an external schottky
diode. The P-MOS will disconnect the output
from the input when EN is low. This output
disconnect feature allows the output to be
completely discharged, thus allowing the part to
draw less than 1uA off current in shutdown
mode.
The 1.1MHz switching frequency allows for
smaller external components; the internal
compensation and soft start minimize the
external component count, all helps to produce
a compact solution for a wide range of load
current.
The MP3120 features an integrated power
MOSFET that supports up to 5V output and a
typical 1.2A switch current.
The device also can maintain the output voltage
regulated even when the input voltage is above
the output voltage.
The MP3120 is offered in a 6-lead ThinSOT23
package
FEATURES
• Up to 96% Efficiency
• True Output Disconnect from Input
• Inrush Current Limiting and Internal Soft-
Start
• 0.8V Low Voltage Start-Up
• Internal Synchronous Rectifier
• Current Mode Control with Internal
Compensation
• Short-Circuit Protection
• 1.1MHz Fixed Frequency Switching
• 0.8V to 5V Input Range
• 2.5V to 5V Output Range
• Tiny External Components
• Small 6-lead ThinSOT Package
APPLICATION
• Single-cell, Two-cell and Three-cell Alkaline,
NiCd or NiMH or single-cell Li Battery
Consumer Products
• MP3 Players
• Wireless Mouse
• Audio Recorders
“Monolithic Power Systems”, “MPS”, and “The Future of Analog IC
Technology” are Registered Trademarks of Monolithic Power Systems,
Inc.
TYPICAL APPLICATION
R3
C5
NC
NC
VIN
1
SW
6 _IN
OUT ⁵
ON/OFF
4 _EN
GND
2
FB ³
VOUT
3.3V
Efficiency
V_OUT=3.3V
100
80
60
40
20
0
1
VIN=3V
VIN=1V
VIN=4.4V
VIN=2V
10
100
1000
OUTPUT CURRENT (mA)
MP3120 Rev. 0.93
www.MonolithicPower.com
1
9/20/2011
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© 2011 MPS. All Rights Reserved.